434 TABANID.E 



the usual hyaline spot across the middle of the submarginal cell extended 

 downwards (with a slightly convex boundary of the blackish part) until it 

 occupies half to two-thirds of the third posterior cell and all its outer 

 boundary, and to all the cubital fork-cell except a vague semicircular washed- 

 out darkened patch on its upper outer part. tSquamse blackish with blacker 

 margins and with scarcely any fringe. Halteres blackish. 



? . Face and frons as in C. quadrata, the large frontal callus and tlie black ocellar 

 space being slightly smaller than in C. ccecutiens ; the yellow line down the 

 middle of the face is the broadest of the three species being about one-third 

 the space between the eyes, while the facial calli are the smallest of the three 

 species and are joined only narrowly or not at all to the oral calli • the facial 

 and oral calli are joiiied the most widely in C. quadrata, while in C. aecntiens 

 they are united almost as narrowly as in C. relicfa, but the oral calli are much 

 smaller in C relicta than in C. necutiens ; the buccal ca'lli are isolated in all 

 three species, but are quite small or rarely almost absent in C. relicta and 

 occasionally so in C. quadrata ; palpi brown in C. quadrata and C. relicta but 

 black in C. crecutieju, and usually palest of all in C. relicta. Antennae with 

 the basal joints, more often reddish orange in C. relicta and G. quadrata thdiW 

 in C. ccecutiens, as in C. ccecutiens they seem to be all or nearly all black. Eyes 

 in life of the same brilliant blue green as, or even bluer than, in C. quadra.ta, 

 but with much smaller dark markings ; the hindmarginal baud is visible on 

 only the lower part of the eye, where it is almost as broad as in C. ccecutiens 

 and C. quadrata, but it fades away before the middle, though just above 

 where the emargination should be there is a faint pale brown spot which 

 indicates the widest projection of the l)and, and sometimes the emargination 

 and the dilatation above it are fairly distinct, Ijut the uj^per part of the hind- 

 margin is not darkened ; the four spots on the disc are small, and the upper 

 three are very isolated, but the bottom ( = third) one is transverse and near 

 the foremargin ; the top ( = first) and bottom spots are the brownest (the 

 others being blackish purple) and may be transverse, the middle ( = second) 

 one small and sometimes more remote from the foremargin so that it is 

 almost in a perpendicular line with the one above and the one below instead 

 of being (as in C. quadrata and C ccecutiens) more remote from the middle of 

 the disc ; fourth ( = hindmost) spot small and rather rounded, far remote from 

 any other dark marking. 



Thorax ashy black (with the usual two broad greyish stripes) instead of 

 the blackish colour of C. ca^cutiens or the more brownish grey colour of C. 

 quadrata (caused by the more abundant tawny pubescence) ; humeri ashy 

 grey, and a rather broad stiipe from the humeri to the wing-base somewhat 

 yellowish grey, but a broad stripe just above the dorsopleural suture may be 



of dark brown ground colour and bear darker tawny 

 pubescence, but ordinarily the dense pubescence on the 

 sides of the disc is pale yellow in contrast to the tawny 

 pubescence of C, quadrata and C. ccecutiens, and on 

 the disc of the thorax there are numerous but not quite 

 dense sloping dull yellow hairs. Pleurie dull yellowish 

 dusted on the mesopleura^ but more ashy greyish on the 

 lower part, and clothed with dense pale yellow (not, or 

 seldom, tawny) pubescence ; on the disc and sides of the 

 thorax and on the pleurae and scutellum there are no 

 black hairs. 



Abdomen (fig. 248) appearing quite distinct from 



the other species, as the pale markings on the third 



and subsequent segments are more obvious • basal 



r, ...c nh^.. , . ;. . Segment Avith more than the middle thii'd of the hind 



9. X 6. margin black and this l)lack part spreading outwards 



anteriorly until it occupies all the Ijase of the segment, 



and consequently a yellow (not orange as in C. quadrata and C. ccecutiens) 



triangle is left occupying each hind corner ; second segment yellow (not 



orange) with a pair of large rather rounded black lobes extending from 



the black portion of the hindmargin of the Ijasal segment downwards and 



outwards across three-quarters of the segment but leaving a dividing yellow 



